http://www.mercyforanimals.org/heres-why-youre-wrong-when-you-say-no-one
Today’s dairy farms house tens of thousands of animals, and in order for a cow to produce milk she must be repeatedly impregnated. (Yes, cows like all other mammals produce milk for their babies.) Once her calf is born, the baby is stolen from her so her milk can be sold. If the calf is male, he is sent off to a veal farm where he will be chained inside a crate so small he can barely move and slaughtered in weeks. If the calf is female, she is kept and raised for dairy.
Constantly giving birth takes a physical toll on the cows. The natural lifespan for a dairy cow is 15–20 years, but due to neglect and constant breeding, cows on modern dairy farms only live about four years. Once they are considered “spent” they are sent off for slaughter, typically becoming ground beef.
